You can change the menu items to link to a product instead of a collection. I appreciate your thinking, decreasing the number of clicks a customer needs to take to check out can help with your conversion rate.
To edit your menu links, here are the steps:
xin the Link field, and then enter or select a new destination from the drop down.
There is a video on editing menu items on our YouTube Help Center if you'd like to follow a visual example. I'll also share a blog article we have on tuning up your product pages to help increase your conversions. I recommend having a read for some ideas, especially if you're customers will be directed straight to your product pages.
Let me know how this goes!